Difference in changes of membrane fluidity of polymorphonuclear leukocytes stimulated with phorbol myristate acetate and formyl-methionyl-leucyl-phenylalanine: role of excited oxygen species.
Polymorphonuclear leukocytes (PMN) were stimulated with phorbol myristate acetate (PMA) and N-formyl-methionyl-leucyl phenylalanine (FMLP) to clarify the role of excited oxygen species in inducing changes of membrane fluidity. Membrane fluidity was assessed by the excimer-forming lipid technique using pyrenedecanoic acid and flow cytometry. Membrane fluidity of PMN decreased following stimulation with PMA, and the extent of decrease was both time- and dose-dependent. FMLP at 10(-5) M induced a decrease, while FMLP at 10(-7) M induced a rapid increase. On stimulation with 10(-7) M FMLP as well as in a resting condition, the change of membrane fluidity of PMN from patients with chronic granulomatous disease (CGD) was similar to that of normal PMN. However, on stimulation with PMA or 10(-5) M FMLP, CGD PMN did not show a significant decrease. In addition, normal PMN incubated with catalase inhibited the decrease. These findings suggest that the generation of excited oxygen species, particularly of H2O2, is important in inducing a decrease of PMN membrane fluidity.
Masuda
M
M
Department of Clinico-Laboratory Medicine, Kansai Medical University, Osaka, Japan.
Komiyama
Y
Y
Murakami
T
T
Murata
K
K
Hasui
M
M
Hirabayashi
Y
Y
Kobayashi
Y
Y
D000328:Adult; D002462:Cell Membrane / Q000187:drug effects / Q000502:physiology / Q000648:ultrastructure; D006105:Granulomatous Disease, Chronic / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D008560:Membrane Fluidity / Q000187:drug effects* / Q000502:physiology; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects* / Q000502:physiology / Q000648:ultrastructure; D010100:Oxygen / Q000502:physiology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
D010566:Virulence Factors, Bordetella; D009240:N-Formylmethionine Leucyl-Phenylalanine; D013755:Tetradecanoylphorbol Acetate; D010100:Oxygen